22-03-17, 12:39 AM
Use a relay to switch on to power to them only when the ignition is on, as this will turn them off when the ignition is turned off. No fear then of flattening the battery that way as you cannot walk away leaving them on.
Take the supply for the relay from somewhere like the horn or brake light circuits and run the power for the heated grips through the relay contacts via a fuse to the battery positive.
Take the supply for the relay from somewhere like the horn or brake light circuits and run the power for the heated grips through the relay contacts via a fuse to the battery positive.